how to check if PPA is already added to apt sources list in a bash script

Question

Do someone know how to check if a PPA is already added to my system before i add it with the add-apt-repository command in a shell script.

That would be very helpful.

Thank you.

Answer 1

You can do something like this:

the_ppa=...  # set appropriately

if ! grep -q "^deb .*$the_ppa" /etc/apt/sources.list /etc/apt/sources.list.d/*; then
    # commands to add the ppa ...
fi

Notes:

• grep exits with success if it finds a match
• The ! negates this, so the commands will be executed if there is no match = ppa not added
• The -q flag makes grep quiet, so it doesn't print the matched lines. It would be just noise, we need only to know if there is a match or not, for which the exit code is perfect
• The ^deb .* prefix is to make sure the matched line starts with deb, to exclude lines that are commented out

Answer 2

Open your terminal and type this command

grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/* | grep fogger

replace fogger with PPA name.

Answer 3

Removing list.save files, sources, ensure only deb lines and count it for "fogger" ppa:

ppa_added=`grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/* | grep -v list.save | grep -v deb-src | grep deb | grep fogger | wc -l`

echo $ppa_added